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Biomolecules

Explore the essential biomolecules that constitute life, including carbohydrates, proteins, nucleic acids, and hormones. Understand their structures, functions, and significance for living organisms.

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CBSE
Class 12
Chemistry
Chemistry - II

Biomolecules

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More about chapter "Biomolecules"

This chapter on Biomolecules is a crucial part of Chemistry for Class 12 students. It delves into the different types of biomolecules that form the foundation of life, notably carbohydrates, proteins, nucleic acids, and hormones. The chapter explains how these biomolecules interact within living systems, contributing to growth, sustenance, and reproduction. Key topics include the classification and characteristics of carbohydrates like monosaccharides, oligosaccharides, and polysaccharides, and a deep dive into proteins and their complex structures. The role of vitamins and enzymes as essential biochemical catalysts is also discussed, emphasizing their importance in maintaining biological functions. Moreover, it clarifies the distinction between DNA and RNA, laying out their roles in heredity and protein synthesis. This comprehensive overview serves as a necessary guide for students to grasp the complexities of biochemical processes fundamental to all life forms.
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Biomolecules - Class 12 Chemistry Chapter

Master the key concepts of biomolecules including carbohydrates, proteins, nucleic acids, and hormones. Understand their structures, functions, and significance in living systems as covered in Class 12 Chemistry.

Biomolecules are organic molecules that are essential for life. They include carbohydrates, proteins, lipids, and nucleic acids. These molecules interact to perform vital functions in living organisms, supporting growth, energy storage, and information transfer.
Carbohydrates are classified based on their molecular structure and hydrolysis behavior into three main groups: monosaccharides (single sugar units), oligosaccharides (2-10 monosaccharides), and polysaccharides (long chains of monosaccharides).
Carbohydrates generally follow the empirical formula Cx(H2O)y. For example, glucose has the molecular formula C6H12O6, which fits into this general formula, highlighting the relationship between carbon and water.
Monosaccharides are the simplest form of carbohydrates, consisting of single sugar units, such as glucose, fructose, and ribose. They cannot be hydrolyzed into simpler sugars and are crucial for various biological processes.
Oligosaccharides consist of 2 to 10 monosaccharide units linked by glycosidic bonds, while polysaccharides are large molecules composed of many monosaccharides (often hundreds or thousands). Polysaccharides serve as energy storage or structural materials.
Proteins play critical roles in biological processes, including serving as enzymes, structural components, and transport molecules. They are made from amino acids linked by peptide bonds and perform diverse functions essential for life.
Amino acids are classified based on the nature of their side chains. They can be categorized as nonpolar, polar uncharged, polar charged, basic, or acidic. This classification affects how they interact within proteins.
Denaturation is the process where proteins lose their native structure due to external factors like heat or pH changes, resulting in the loss of biological activity. While primary structure remains intact, secondary and tertiary structures are disrupted.
A glycosidic linkage is a type of covalent bond that joins monosaccharides together to form disaccharides or polysaccharides. It occurs through a condensation reaction where a water molecule is released.
Enzymes function as biocatalysts that speed up biochemical reactions by lowering the activation energy required. They are specific to their substrates and can significantly increase the rate of reactions in living organisms.
Vitamins are organic compounds required in small quantities for various metabolic processes. They play crucial roles in health, facilitating bodily functions and preventing deficiency diseases. Some vitamins must be obtained through diet.
Nucleic acids, such as DNA and RNA, are polymers made from nucleotide monomers, consisting of a sugar, phosphate group, and nitrogenous base. They are vital for storing and transmitting genetic information.
DNA (deoxyribonucleic acid) is double-stranded and contains the sugar deoxyribose with thymine as a base, while RNA (ribonucleic acid) is usually single-stranded, contains ribose, and has uracil instead of thymine.
Hormones function as intercellular messengers produced by endocrine glands. They regulate various physiological processes by binding to specific receptors on target cells, thus influencing functions like metabolism and growth.
Nucleic acids are responsible for heredity as they carry genetic information from one generation to the next. DNA replicates during cell division, ensuring genetic continuity, while RNA aids in protein synthesis.
Reducing sugars are carbohydrates that can donate electrons to other molecules (e.g., glucose, fructose), whereas non-reducing sugars (e.g., sucrose) do not have free aldehyde or ketone groups under physiological conditions.
Glycogen is a polysaccharide that serves as the main energy storage form in animals. It is primarily found in the liver and muscles, where it can be quickly converted to glucose when energy is needed.
Cellulose is a polysaccharide that is a critical component of plant cell walls, providing structural support. Unlike starch, it is not digestible by humans, but it contributes to dietary fiber, which aids digestion.
Hormones like growth hormone and sex hormones (testosterone and estrogen) play vital roles in regulating growth, development, and metabolism. They influence pubertal changes, muscle development, and overall physical growth.
Carbohydrates serve as a primary energy source for living organisms. In plants, they are stored as starch, while in animals, they are stored as glycogen. Both forms can be readily converted to glucose when energy is required.
The primary structure of a protein refers to its specific sequence of amino acids linked by peptide bonds. This sequence determines the protein's unique characteristics and functions.
An enzyme's structure, particularly its active site shape, is crucial for its function. The specific conformation allows enzymes to bind to their substrate(s) precisely, facilitating the biochemical reaction and ensuring efficiency.
Vitamins are classified based on their solubility: fat-soluble vitamins (A, D, E, K) dissolve in fats and oils, while water-soluble vitamins (B-complex, C) dissolve in water. Their solubility affects their absorption and storage in the body.
Ribosomes are cellular structures where protein synthesis occurs. They read mRNA sequences and facilitate the binding of amino acids brought by tRNA, linking them together to form polypeptides, which ultimately fold into functional proteins.

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Aldehydes, Ketones and Carboxylic Acids

This chapter focuses on the study of aldehydes, ketones, and carboxylic acids, which are crucial functional groups in organic chemistry.

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Amines

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